Sequences and Series Formulas
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5 Terms
1
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nth term of an arithmetic sequence
an = a1+(n-1)d
2
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sum of arithmetic
Sn=n/2(a1+an) OR Sn=n/2{2a+1(n-1)d]
3
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nth term of a geometric sequence
an=a1*rn-1
4
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sum of geometric
Sn=a1(1-rn)/1-r
5
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sum of infinite geometric
S∞=a1/1-r
Note 
Flashcards (25)